中文摘要：

黄龙山林区是陕西五大林区之一,具有独特的地理位置和历史文化氛围（和启孝,1991）,同时又是陕西黄土高原森林分布最集中、野生动植物资源最丰富的地区,是庇护陕北黄土高原南部、渭北高原和关中平原的主要生态屏障。以前对黄龙山的研究主要集中在森林的群落特征、类型划分、群落动态、和优势种群更新等方面（侯琳等,2006;康永祥等,2007;相辉等,2001）,

英文摘要：

Based on the forest inventory data of Huanglong Mountain in 1986,1997 and 2006,we analyzed the changes of landscape types and landscape structure.The landscape was changed greatly during the 20 years.The area of forested land continuously was increased,while the shrub land and wasteland were gradually decreased.The area of the cultivated land and immature forest land increased from 1986 to 1997,while decreased from 1997 to 2006.Changes in Cupressus forest land and nursery land,which accounted for only a small part of the entire landscape,were not significant.At the landscape level,the area of hard broad-leaved forests and coniferous forests was increased by 40% from 1986 to 2006.The area of Cupressus forest land remained unchanged at approximate 2 000 hm2 during the two periods,while the area of soft broad-leaved forest land continuously decreased.Moreover,the age-class structure of the major species significantly varied.The hard broad-leaved forests and coniferous forests merged with a block which had the largest patch index and was much greater than that of the other landscape types in each period.The landscape diversity decreased,while the landscape heterogeneity,fragmentation and dominance increased.The patch types tended to distribute in reunion state.